Exploring the MPU9250
Background
Inspired by :
Hrisko, J. (2019). Accelerometer, Gyroscope, and Magnetometer Analysis with Raspberry Pi Part I: Basic Readings. Maker Portal.
I bought a breadboard with the MPU9250 chip to experiment with its accelerometer and gyroscope.
The breadboard is used together with a Raspberry Pi and a WiFi adapter:
First Steps
- Enabling communication of I2C devices on the RaspberryPI
- testing the communication using Linux tools
- installing Python library to access I2C devices from Python
- configuring I2C settings on RaspberryPI
- getting / modifying a Python utility / library to configure the MPU9250 chip and read accelerometer & gyroscope data
More details are available on GitHub:
https://github.com/michaelbiester/mpu9250
The Readme file on GitHub provides more information how to setup the chip and how to read data of the accelerometer and gyroscope with Python. A Jupyter notebook visualizes two recordings each having 1000 data points. A PDF version of the notebook is available too:
https://github.com/michaelbiester/mpu9250/blob/master/ipython/mpu9250/trace_plot.pdf
Another notebook on GitHub explores the repeatability of static measurements with the MPU9250. Some posts claim that there is a repeatability issue with the gyroscope. However I could not confirm this claim. More of that can be found here:
https://github.com/michaelbiester/mpu9250/blob/master/ipython/mpu9250/repeatability_1.pdf
Resources
Exploring Raspberry Pi / Interfacing to the Real World with Embedded Linux; Author: Derek Molloy; Publisher: John Wiley & Sons, Inc.
Raspberry Pi User Guide, Authors: Eben Upton, Gareth Halfacree; Publisher: John Wiley & Sons, Inc.
https://readthedocs.org/projects/smbus2/downloads/pdf/latest/